1273273640 has 64 divisors (see below), whose sum is σ = 2909088000. Its totient is φ = 501507072.

The previous prime is 1273273627. The next prime is 1273273649. The reversal of 1273273640 is 463723721.

It is a self number, because there is not a number n which added to its sum of digits gives 1273273640.

It is not an unprimeable number, because it can be changed into a prime (1273273649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 819104 + ... + 820656.

It is an arithmetic number, because the mean of its divisors is an integer number (45454500).

Almost surely, 2^1273273640 is an apocalyptic number.

1273273640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1273273640 is an abundant number, since it is smaller than the sum of its proper divisors (1635814360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1273273640 is a wasteful number, since it uses less digits than its factorization.

1273273640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1866 (or 1862 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 35.

The square root of 1273273640 is about 35682.9600790069. The cubic root of 1273273640 is about 1083.8618147859.

The spelling of 1273273640 in words is "one billion, two hundred seventy-three million, two hundred seventy-three thousand, six hundred forty".